GMPartsGiant.com offers the wholesale prices for genuine 2003 Chevrolet Silverado 1500 SS 4WD parts. Parts like Spare Wheel Carrier are shipped directly from authorized GM dealers and backed by the manufacturer's warranty. Parts fit for the following vehicle options. Engine: 6 Cyl 4.3L, 8 Cyl 4.8L, 8 Cyl 5.3L, 8 Cyl 5.3L Flex, 8 Cyl 6.0L. Model Code: 1500 EXTENDED CAB STANDARD BOX, 1500 REGULAR CAB STANDARD BOX.